You don't use tubes with really long valves (too heavy) so you need a valve extender which screws on the top of the presta valve to inflate the tyre and then unscrews.

You need to take one of these every journey if you want to inflate your tyres after a puncture

Click to expand...

I understand what you say but once you inflate the tyre with the extender, how you take it out, do you leave the core of the valve tube open since it is inside the carbon ferrying?

Also another question is, I usually use latex tube which I have with my Vitorria Evo Corsa tyre and the latex valve is long. I believe long enough for the cosmic SL 52 deep section without extender. Would it be smarter to use it, or to use another latex with shorter valve (if that kind of thing exist) and the extender as you said or to use a regular tube with short valve and extender as you said.

I understand what you say but once you inflate the tyre with the extender, how you take it out, do you leave the core of the valve tube open since it is inside the carbon ferrying?

Also another question is, I usually use latex tube which I have with my Vitorria Evo Corsa tyre and the latex valve is long. I believe long enough for the cosmic SL 52 deep section without extender. Would it be smarter to use it, or to use another latex with shorter valve (if that kind of thing exist) and the extender as you said or to use a regular tube with short valve and extender as you said.

Click to expand...

I used intermediate length valves - you could see the top inside the fairing and it was easy to screw it down with a needle.

I'd use what you have - my only problem was that the track pump I use needed more than 10mm of the valve protruding to get a good air-tight grip.

So I got today my Cosmic SL and I went to first ride. Don't know what to say beside they felt heavy comparing my Zipp 404 tubular when I mounted them on my bike but when I went out with them, they were fast, faster as I thought and hope they will be. In fact I did my best result with them, I was much faster on the same route than with my 404. I went two circles under the 8 minutes while I never succeeded to go below the 8 minutes when any wheelset I had. What does it say about the Zipp which weight about 500gr less with Conti tubs? Does it make sense? Do I need to let go of the Zipp or send hem to Zipp for inspection and service maybe..,? Its true I didn't went any hills yet with the CC SL but I have the feeling that I'll do Richmond Park with quite A hilly terrain faster with them as well.